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The comparison of microtensile bond strength with immediate and delayed dentin sealing  

Lee, Heung-Bae (Department of Prosthodontics, College of Dentistry, Yonsei University)
Han, Chong-Hyun (Department of Prosthodontics, College of Dentistry, Yonsei University)
Shim, Jun-Sung (Department of Prosthodontics, College of Dentistry, Yonsei University)
Kim, Sun-Jai (Department of Prosthodontics, College of Dentistry, Yonsei University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.46, no.4, 2008 , pp. 372-380 More about this Journal
Abstract
Purpose: The purpose of this study was to evaluate the effect of various methods of dentin bonding agent application on microtensile bond strength between dentin and resin, using a 2-step etch-and-rinse dentin bonding agent. Material and methods: Twenty freshly extracted human molars were obtained and divided into 4 groups of 5 teeth. 2-step etch-and-rinse dentin bonding agent was used for all groups. The control specimens were prepared using a direct immediate bonding technique. The delayed dentin sealing (A, C) specimens were prepared using an indirect approach with delayed dentin sealing. For group A, resin was built-up on uncured dentin bonding agent, and for group C, resin was built-up on pre-cured dentin bonding agent. Preparation of the immediate dentin sealing (B) specimens also used an indirect approach with immediate dentin sealing immediately following preparation. All teeth were prepared for a microtensile bond strength test. Specimens were stored in water for 24 hours. Ten beams (1.0 ${\times}$ 1.0 ${\times}$ 11 mm) from each tooth were selected for testing. Bond strength data (MPa) were analyzed with a one-way ANOVA test, and post hoc comparison was done using the Scheffe's test. Results: The mean microtensile bond strengths of control group, B and C (DDS with pre-cure) were not statisticaaly different from each other at 32.7, 33.3, 34.2 MPa. the bond strength for group A (DDS without pre-cure), 19.5 MPa, was statistically different (P < .01) from the other 3 groups. Conclusion: When preparing teeth for indirect bonded restorations, DDS with pre-curing dentin bonding agent and IDS results in the same bond strength between dentin and resin. On the contrast, the bond strength was decreased when DDS without pre-curing dentin bonding agent was used.
Keywords
Immediate dentin sealing; Delayed dentin sealing; Dentin bonding; Microtensile bond strength;
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